Unauthenticated Management API Exposure in Known's Software by Known's Dev
CVE-2026-86543

9.3CRITICAL

Key Information:

Vendor

Knowns-dev

Status
Knowns
Vendor
CVE Published:
7 September 2026

What is CVE-2026-86543?

Versions of Known's Software before 0.30.0 expose the management API without any authentication, allowing unauthorized access to critical endpoints. By default, fresh installations permit unauthenticated access to the /api/tunnel/start endpoint across all network interfaces. This vulnerability enables attackers to provision a public tunnel and could potentially republish the management API at a publicly accessible address, significantly increasing the risk of data exposure and unauthorized control.

Affected Version(s)

knowns 0 < 0.30.0

knowns 0.30.0

References

https://github.com/knowns-dev/knowns/security/advisories/...
vendor-advisory
https://github.com/knowns-dev/knowns/blob/v0.29.1/interna...
technical-description
https://github.com/knowns-dev/knowns/blob/v0.29.1/interna...
technical-description

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Tong Hoang Gia
Nguyen Huy Hoang
.